sixthform collage

Im so lost about going to sixthform attached to my secondary or a sixthform collage. I dont want to continue my alevels in my school beacuse i want to start fresh but at the same time i feel like i dont get the same support in collage like i would in school beacuse the teachers already know me and my academic weakness so it may be extra helpful but i dont know i dont like the enviromwnt here